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"Following identification of the security incident, we conducted a thorough investigation and are confident that we have the processes and procedures in place to avoid the possibility of an incident of this nature happening in the future."

Parliament House is undergoing a security upgrade. (AAP) ()

“We also understand that there has been no compromise to the security of Parliament House.”

Yesterday, a Senate committee was told the document went missing in November and the Department of Parliamentary Services was not notified until February.

The President of the Senate, Stephen Parry, said that security manual was “an early draft”.

“A lot of the matters are now redundant,” he said.

“A lot of matters have been modified and over 50 percent of the materials that were going to be sourced were commercially available. It is not a serious breach of security, and security at Parliament House has not been compromised.”

But 9NEWS understands the document contained a set of blueprints for Parliament House. That material is not publicly available and its loss represents a significant security breach.

The Department of Parliamentary Services conducted an independent review of the incident but BAE was only required “to re-assess its document-handling procedures”.

The man in charge of Parliament’s security, Paul Cooper, said he had not informed other government agencies of the security breach by BAE.

Now that BAE has been named as the culprit it will, no doubt, be of interest to Defence, which is assessing bids for its $35 billion Future Frigate project, to build nine warships to replace the Anzac fleet.